The Lunar Eclipse that revealed the final Blood Moon
A total lunar eclipse took place between September 27th and 28th, 2015. It was seen Sunday evening, September 27, in the Americas; while in Europe, Africa, and the Middle East, it was seen in the early hours of Monday morning, September 28.
A lunar eclipse will occur when the Moon passes within Earth's umbra (shadow). As the eclipse begins, Earth's shadow first darkens the Moon slightly then, the shadow begins to "cover" part of the Moon, turning it a dark red-brown colour (typically – the colour can vary based on atmospheric conditions). The Moon appears to be reddish because of Rayleigh scattering (the same effect that causes sunsets to appear reddish) and the refraction of that light by Earth's atmosphere into its umbra. Also to note is that the Moon appeared larger than normal because it was just 59 minutes past its closest approach to Earth in 2015 at mid-eclipse, which is sometimes called a supermoon. The Moon's apparent diameter was larger than 34' viewed straight overhead, just off the coast of northeast Brazil.
It was the latter of two total lunar eclipses in 2015, and the final in a tetrad which are four total lunar eclipses in series. Other eclipses in the tetrad are those of April 15, 2014, October 8, 2014, and April 4, 2015.
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